According to the different nature of music, the Book of Songs is divided into three categories: Feng, Ya and Song. ①Wind. It is local music from different regions, mostly folk songs. "Wind" poems are folk songs collected from 15 regions including Zhounan, Zhaonan, Bei, Yong, Wei, Wang, Zheng, Qi, Wei, Tang, Qin, Chen, Hui, Cao and Bin. ***160 articles. Most of them are folk songs. ②Elegance. That is, the music of the imperial court is the music of the areas directly under the Zhou Dynasty. Most of it is the work of the nobles, which is the so-called formal music. "Ya" poems are songs for palace banquets or court meetings. According to different music, they are divided into 31 poems in "Daya", 74 poems in "Xiaoya" and 105 poems in "Xiaoya". Except for a small number of folk songs in "Xiaoya", most of them are works by aristocratic literati. ③Ode. They are songs and epics performed in ancestral temples, mostly praising the achievements of ancestors. The "Song" poems are divided into 31 "Zhou Songs", 4 "Lu Songs", 5 "Shang Songs", and 40 *** poems. All are works by aristocratic literati. From a time perspective, "Zhou Song" and most of "Daya" should have been produced in the early Western Zhou Dynasty; a small part of "Daya" and most of "Xiaoya" should have been produced in the late Western Zhou Dynasty to the eastward movement; "Guofeng" Most of them and "Songs of Lu" and "Songs of Shang" should have been produced in the Spring and Autumn Period. From the perspective of ideological and artistic value, the three poems are not as good as the two elegances, and the two elegances are not as good as the fifteen national styles.